[82] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Text;
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| 25 | using System.Xml;
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| 26 | using HeuristicLab.Core;
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[1853] | 27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[82] | 28 |
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| 29 | namespace HeuristicLab.Data {
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[737] | 30 | /// <summary>
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| 31 | /// A class that represents <c>null</c>.
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| 32 | /// </summary>
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[1853] | 33 | [EmptyStorableClass]
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[82] | 34 | public class NullData : ObjectData {
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[737] | 35 | /// <summary>
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| 36 | /// Gets <c>null</c> and throws an exception in the setter.
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| 37 | /// </summary>
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| 38 | /// <exception cref="InvalidOperationException">Thrown when the setter is called.</exception>
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[82] | 39 | public override object Data {
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| 40 | get { return null; }
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| 41 | set { throw new InvalidOperationException("Data property of NullData cannot be set"); }
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| 42 | }
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| 43 |
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[737] | 44 | /// <summary>
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| 45 | /// Initializes a new instance of <see cref="NullData"/> with <c>null</c>.
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| 46 | /// </summary>
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[82] | 47 | public NullData() {
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| 48 | base.Data = null;
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| 49 | }
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| 50 |
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[737] | 51 | /// <summary>
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| 52 | /// Clones the current instance.
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| 53 | /// </summary>
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| 54 | /// <remarks>Adds the cloned instance to the dictionary <paramref name="clonedObjects"/>.</remarks>
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| 55 | /// <param name="clonedObjects">All already cloned objects.</param>
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| 56 | /// <returns>The cloned instance as <see cref="NullData"/>.</returns>
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[2526] | 57 | public override IItem Clone(ICloner cloner) {
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[82] | 58 | NullData clone = new NullData();
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[2526] | 59 | cloner.RegisterClonedObject(this, clone);
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[82] | 60 | return clone;
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| 61 | }
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| 62 | }
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| 63 | }
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